I've owned 2 pre-2000 Vettes, both 99's. 99' FRC (Hardtop) and 99' Coupe, the Coupe I still have. I would be inclined to take a look at the rear diff. for any leaks. I would also check the shifter engagement into first and into reverse if it is a manual. The seat stitching was not good these years, so check for wear along the bolsters. Mostly, you really can't ask for a better car considering what you get for the money. Right now, an early C5 is probably the best bargain out there, and can still bury about 98% of the cars you'll ever decide to run against on the road. These cars also respond very well to mods. and horsepower if that is your thing, or will drive around town just as comfortable and docile as an Impala. Gas mileage is incredible making 30mpg easily on the highway, in the high speed lane. If you are lucky enough to find one with under 40K miles, you'll have a real nice car for sure. Against other makes, higher mileage Vettes are still very nice, due to the way most Corvette owners treat their cars, typically better than any other on average. Good luck with your search, or purchase.